Placental Trypanosoma cruzi infection is restricted by nitric oxide production by endothetial nitric oxide synthase isoform

L. MEZZANO 1 , G. MAZZUDULLI 1 , M. PIEGARI 1 , A.G. SCHIJMAN 4 ,

PLACENTA

W B SAUNDERS CO LTD

Lugar: Londres; Año: 2017 vol. 51

0143-4004

Human placenta avoids Trypanosoma cruzi (T. cruzi) infection by differentmechanisms and the production of nitric oxide (NO) is one of them.Objective: To elucidate the importance of NO production in the parasiticload in placental tissue and the relevance of endothelial nitric oxide synthase(eNOS) isoform as a major NO producer.Methods: Placentas from caesarean delivery from clinically andserologically healthy women and Trypomastigotes of T. cruzi isolatedfrom a congenital case (named Lucky) were used. Placental villi explantswere co-cultured in RMPI 1640 for 24 h with or without(control) 1 x106 trypomastigotes of Lucky (TcII -VI strains). Cultureswere treated with NOS inhibitor NG-nitro-L-arginine methyl ester (LNAME)at 0.1 and 1 mM. Quantification of eNOS expression byimmunohistochemistry and Western blot, nitrite level in media supernatantwith Griess technique, and parasitic load by qPCR withTaqman probes were assayed.Results: Placental explants in the presence of T. cruzi showed a significantincrement of eNOS protein abundance (7.2 ± 0.94 fold, P